Demountable tire rim



May-1, 1923.

c. s. MAiQTlN DEMOUNTABLE TlRE'RIM Filed April 1o 1922 CLSJWR m,

Patented May l, .1923.

CLEMENT S. MARTIN, 0F ROCK'VILLE, MARYLAND.

' DEMOUNTABLE TIRE lnaar.

Application flied April i0, 1922. Serial No. t.

To all whom t'mag/ concern:

Be it known that I. CLminNT S. lilanrin. acitizen of the United States. residing at Rockville. in the county ot' Montgomery and State of Maryland, have invented certain new and useful Improvements in Dc-v mountable Tire Rims; and l do hereby de- Clare the followingv to be a full. clear. and exact description of the invention, such as will'enable others skilled in the ai't to which it appertains to make and use the same.

The present invention-relates to demountable rims for pneumatic tires, and aims to provide a demountable tire rim having: novel and kimproved means for contracting.,r and expanding the rim to faeilitatethe removal and application of the tire.

Another object of the invention is to coinbine with the rim a compact. simple and eiiicient device for moving the end portions of the rim toward and away from one another for contracting and expanding the riiu in a convenient and practical manner.

A further object is the provision of such a device which is also operable for sepi ating the ends of the rim to assist in the contraction of the rim.

A still further object is the provision otsuch a device comprising a rotatable member carried by one end portion of the rim and a portion carried by the other end ot the rim, said rotatable member and second- ,namcd portion hai/iup means to engage one another whereby the rotation of said member will contract or expand the rim according to the direction of rotation.l

With the foregoing and other objects in View, which will be apparent as the description proceeds, the invention resides iu the construction and arrangement of parts. as hereinafter described and claimed, it being understood that changes can be made within the scope ot' what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein- Figurel is a view, partly in elevation aud partly in longitudinal section` showing the improved device with the rim iu place on a wheel.

Fig. 2 is a longitudinal ei-tion oi' the end portions of the rim showing; same sep- -ally as shown.

arated to contract the rim, portions beine; shovvn in elevation. i

Fig. 3 is a plan vien7 of the joint ot the rim.

Fig. 4 is a section on the line H ot Fig.

Fig. 5 is a cross section on the line 5-5 of Fig. l with the wheel telly omitted.

The rim 7 may be of any suitable cross section, according to the prevailing types, and is composed of suitable resilient or bendable metal. The rim is split or divided transversely at one point. and the ends thereof are adapted 'to abut when the rim is expanded to normal position. A tongue 8 projects from one end of the rim, and is oitset inwardly therefrom, as at i), to overlap the inner surface of the opposite end portion" of the rim. The tongue or portion 8 has a longitudinal open ended slot l() for receiving a ,post l1 projecting inwardly from the other end portion of the rim. The outer end of the post ll is riveted or otherwise rigidly secured. as at 12, to the rim, and said post is preferably tubular so that it can receive the usual valve stein of the inner tube.

.i rotatable member 13 is mounted on the post 11. air'. in the arrangement as shown, the post is screw-threaded and the member 13 screwed on the post to more longitudinally on the post as well as rotate thereon. This member 13 provides both a nut or clamping member t'or clamping the tongue or portion S against the end portion of the rim to which the post is secured. and also as a means for moving thc yends otl the rim toward and away from one another, both ciijruni'tcrentially and radi- 'ihe member lli is formed adjacent to its outer cnd or face with an annular groove 1i receiving the edge portions of the tongue 8 alon; r the edges ot' the Slot 10, thereby4 slidably mountingr the tongue 8 in the xgroove li. but compelling: the tongue 8 and correspondin cr end portion ot' therini to move inwardly aml outwardly with the member lli when said member is rotated on the post ll. The member li is formed at the bottoni ot' the z fi'oovey I4 with the near teeth 15 forming a` lrear wheel or pinion` and said member 1? has u flange i6 overlapping the outer surface ot' thc tongue S, 'lhe inner Ll l) surtace ot the rim is tormed around the base ot the post 11 with a recess or depression 17 tor receiving the flange 1G when the parts are clamped together, as seen in Fig. 1.

ln order to move the ends ot the rini lontndinally with reterence toy one' another; ,he toi'igue 8 isJ provided along one edge ot l the slot 10 'with teeth torining a.l rack 18 to mesh with. the teeth or pinion portion 15 ift thomember 13, and there are smooth arcuate portions 1) and 2,() beyond the ends ot the rack 18 tor the turningl nioveinent ot the pinion 15 without moving the rack 1S.

The post V11 is inserted inwardly through an opening 21 in the wheel telly 22, which opening is made slightly larger than the usual opening tor the .valve stem ot the tire, the valve stem projecting through the post 11. lt is preterable to screw a nut .23 on the post to bear against the inner the telly.' rthe post fitting within the opening will prevent any longitudinal creeping or displacement ot the rim on the telly. By removing the nut 23. the i opposite portion ot the rim can hc shifted oli' ot the telly, so that the rim can be moved to withdraw the post 11 trom the opening 21..' In applying the rim to the telly the post 11 is inserted through the opening then shitted laterally onto the telly, similar to the manner ot applying an ordinary demountable rim.

l/Vhen the rim is in expanded normal position, the ends thereot abut one another, and

the pinion 15 tits the smooth arcuate portion 19 at the end ot the slot 10, the member 15 being rotated to clamp the tongue 8 against the end portion ot the rim which it overlaps, seen in Fig. l. and the flange l5 is seat-ed in the recess or depression 1T. To contract the rim, a'ter it has been removed trom the telly, the member 13 is rotated on the post il to move it away trom thc hase of the post, thereby separating the end portions ot the riin. and when such end l'iortions are separated, the rack 1t? can move into engagement with the pinion 15. so that the 'further rotation ot the ineniher 15 will cause the end portions ot the rim to be moved longitudinallv toward one another, as seen in Fig. 2. "flu: end portions of the rim are tlieretore not only separated radially lait are also moved longitudinally together, to contract the riin so that the tire van he readily removed therefrom and replaced. Attter the rari( liq'lias been moved by the pinion 15, the smooth arcuate portion 2() engages the pinion, thereby permitting the inein'her lil t be rotated ai'ilier. without moving the end portions' ol" the rini longiiiidiiially` but to .separate said end portionsv radially farther,

' it" desired.

li'hen the tire has been placed on the rim, n lili the riin iii .contracted position, the rim periphery otv 21 and the rim is easily expanded by rotating the member 13 in the reverse direction, causing the pinion 15 to move the rack 18 so as to move the end portions ot the rim longitudinally away trom one another, until the smooth portion 19 comes into engagement with the pinion 15, which will stop such longitudinal separation ot the end portions ot the rim. However, by turningthe member 13 farther, it is secrewed on the post 11 to the base thereot, therebyclamping the tongue 8 against the-end portion ot the rim which it overlaps, and holding the ends of the rim in abutment.

The present device thus provides a' simple and effective means tor conveniently separating the ends ot the rim and contracting the rim tor the removal and application ot the tire, and by reversing the rotation ot thek I member 13, the rim is again expanded and the ends thereof brought into position.

Having thus described the invention, what is claimed as new is 1. A ltransversely split tire rim, anda rotatable radial member having a screw connection with one end portion ot the rim, the other end ot the rim having a portion engaging said member to be moved thereby.

2. A transversely split tire rim, and a rotatable member having a screw connection with one end portion ot the rim, and the other end ot the, rim having a portion engaging said member to be moved toward and away trom the first-named portion, the lastnamed portion having a rack and the rotatable member having a pinion portion to engage and move the rack. l

A transversely split tirel rim` and a rotatable member having a screw connection with one end portion ot the rim and having an annular groove and pinion, the other end ot the rim having a slotted portion in which said member is disposed and engaged in said groove, said slotted portion having a rack to engage -said pinion.

4. A transversely split tire rim, a rotata'ble member having a screw connection with one end portion ot the rin and annular groove, and the other end of the rim having a slotted portion receiving saith member and engaging in said groove.

5. A transversely split tire rim, a rotatable memberhaving a screw connection with one end portion of the rim., and having a pinion, the other end of the rim having a portion engaging said memberito move therewith toward and away trom the first-named end portion, the last-named portion having a rack to be engaged by said pinion and having smooth portions at the ends ot the rack to permit the pinion to turn after moving the rack.

(3. A transversely split tire rim, a rotatable member having a screw connection with one end portion of the riin and hav lill having'an g an` annular groove and a, pinion, the

1 otlier end of the rim having a slotted porof the rim having a portion to engage said' member to be moved radially and longitudinally toward and away from the firstnamed end portion by the movements of said member on the postl 8. A transversely split -tire rim, a post secured to one end portion ofl the rim, a rotatable member. threaded on the post, and having a pinion, and a portion carried by the other end ot' the rim having a slidable connect-ion with said member and a rack to engage said pinion.

9. A transversely split tire rim, a post secured to oneend portion of the rim, and a member threaded on the post, the other end of the rim having `a portion to engage said member and to be clamped againstl and moved away from the first-named end portion b v said member.

1l). A transversely split tire rim, a post .secured to one end portion thereof, and a member rotatable onv the post havinga pinion, the other end of therim having a rack to engage said' pinion.

11. A transversely split tire rim, a post secured to one endaportion thereof, and a member screw-threaded on the post having an annular groove and a pinion, the other end ot' the rim having a slotted portion -receiving said member and engaging in said groove, the slotted portion having a rack to engage said pinion.

l2. A transversely split tire rim. a post secured to one end portion ot' the rim, and

.a member screw-threaded on the post and having a pinion, the other end ot' the rim having a portion engaging said member and provided with a rack to engage said pinion and smooth portions at the ends of the rack to permitthe pinion to turn after moving the rack.

13. A transversely split tire rim, a post 'secured to one `end portion of the rim, and

a member screw-threaded .on the post and having anl annular groove and a pinion, the other end ot' the rim having a slotted portion to overlap the first-named end portion and receiving said'member, said slotted portion engaging in said groove and being provided with a rackfto engage the pinion' and smooth portions at the ends of the rack to permit the pinion to turn after' moving` the rack.

' 14. A transversely split tire rim, a tubular post-` secured to one end portion of the rim to receive the valve stem, and means movably mounted on said post for-moving the end portions of the rim to contnact and ex pand the rim.

15. A transverselv` split tire "rim, an

.means assembled with the end portions f said rim andV operable byscrew action for displacing the end portionslof. the 'rim radially and then operablel by gear action for moving said end portions longitudinally to contract the rim.

16. A transversely split tire riln, and

means carried by one end portion of said rim operable for contracting and expanding the rim, the other end portion of the rim engagingr said means, and said means being constructed and arranged to have a screw action for shifting the end portions radially relatively to one another and toY have a gear action-for moving them longitudinally relatively to one another.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CLEMENT S. MARTIN. Witnesses v HENRY SCHILP?, Jamas MILLS. 

